Client crashes after i Alt+Tab while loading

This has been happening to me over all the years i have played League and it's very infuriating that i have to turn off my pc every time of use task manager in order to get back in game.Just recently i almost lost a ranked game because of this and couldn't do anything the whole game.Please work on this bug or whatever is causing it,because it's impossible to play like this and i am sure i am not the only one who is having this problem.
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